"T-odd effects" in unpolarized Drell-Yan scattering

Leonard P. Gamberg; Gary R. Goldstein

doi:10.1016/j.physletb.2007.05.043

"T-odd effects" in unpolarized Drell-Yan scattering

Leonard P. Gamberg, Gary R. Goldstein

Division of Science (Berks)

Research output: Contribution to journal › Article

21 Scopus citations

Abstract

We consider the leading twist "T-odd" contributions as the dominant source of the cos 2 φ{symbol} azimuthal asymmetry in unpolarized p over(p, ̄) → μ^- μ⁺ X di-lepton production in Drell-Yan scattering. This asymmetry contains information on the distribution of quark transverse spin in an unpolarized proton. In a parton-spectator framework we estimate these asymmetries at 50 GeV center of mass energy. This azimuthal asymmetry is interesting in light of proposed experiments at GSI, where an anti-proton beam is ideal for studying the transversity properties of quarks due to the dominance of valence quark effects.

Original language	English (US)
Pages (from-to)	362-368
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	650
Issue number	5-6
DOIs	https://doi.org/10.1016/j.physletb.2007.05.043
Publication status	Published - Jul 12 2007

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All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

Cite this

Gamberg, L. P., & Goldstein, G. R. (2007). "T-odd effects" in unpolarized Drell-Yan scattering. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 650(5-6), 362-368. https://doi.org/10.1016/j.physletb.2007.05.043

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AB - We consider the leading twist "T-odd" contributions as the dominant source of the cos 2 φ{symbol} azimuthal asymmetry in unpolarized p over(p, ̄) → μ- μ+ X di-lepton production in Drell-Yan scattering. This asymmetry contains information on the distribution of quark transverse spin in an unpolarized proton. In a parton-spectator framework we estimate these asymmetries at 50 GeV center of mass energy. This azimuthal asymmetry is interesting in light of proposed experiments at GSI, where an anti-proton beam is ideal for studying the transversity properties of quarks due to the dominance of valence quark effects.

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10.1016/j.physletb.2007.05.043